import {
	overviewStats,
	usageSeries,
	usageByModel,
	topTools,
	recentSessions,
	hourOfDayActivity,
	cacheEfficiency,
	usageGauges,
	type Bucket,
	type TimeWindow
} from '$lib/server/queries';
import { resolveRange } from '$lib/server/range';
import { getCostByProject } from '$lib/server/stats/byProject';
import { getGaugeHistory } from '$lib/server/stats/gaugeHistory';
import { getWebUsage } from '$lib/server/stats/webUsage';
import { getToolErrors } from '$lib/server/stats/toolErrors';
import { getTopActivity } from '$lib/server/stats/topActivity';
import { getLatencyTrends } from '$lib/server/stats/latency';
import { getActivityCalendar } from '$lib/server/stats/calendar';
import { getPunchcard } from '$lib/server/stats/punchcard';
import type { PageServerLoad } from './$types';

const TOP_TOOLS_LIMIT = 10;
const RECENT_SESSIONS_LIMIT = 7; // dashboard shows a short preview; full list lives at /sessions
const DAY_MS = 86_400_000;

export const load: PageServerLoad = async ({ url }) => {
	const range = resolveRange(url);
	const window: TimeWindow = { since: range.since, until: range.until };
	// usageSeries needs concrete bounds; fall back to a 30-day span if the DB is empty.
	const seriesSince = range.since ?? new Date(Date.now() - 30 * DAY_MS).toISOString();
	const bucket: Bucket = range.bucket;

	const byModel = usageByModel(window);

	return {
		range,
		overview: overviewStats(window),
		series: usageSeries(seriesSince, range.until, bucket),
		modelSet: byModel.map((m) => m.model), // stacking order (cost desc)
		byModel,
		hourly: hourOfDayActivity(window),
		cache: cacheEfficiency(window),
		topTools: topTools(TOP_TOOLS_LIMIT, window),
		recentSessions: recentSessions(RECENT_SESSIONS_LIMIT, window),
		gauges: usageGauges(),
		projects: getCostByProject(window),
		gaugeHistory: getGaugeHistory(window),
		webUsage: getWebUsage(window),
		toolErrors: getToolErrors(window),
		topActivity: getTopActivity(window),
		speed: getLatencyTrends(window),
		activityCalendar: getActivityCalendar(),
		punchcard: getPunchcard(window)
	};
};